ci: change ffmpeg to version 8.

crates/oak-audio/Cargo.toml

@@ -16,7 +16,7 @@ oak-codec = { path = "../oak-codec" }
 # ffmpeg_bridge library existed only to absorb FFmpeg API churn; the Rust
 # crate calls ffmpeg-next directly (same as oakcodec). The oak-ffmpeg-link
 # dependency above emits the transitive link flags of the static FFmpeg.
-ffmpeg-next = "9"
+ffmpeg-next = "8"
 
 # ASIO is intentionally not enabled: the asio-sys crate needs the proprietary
 # Steinberg ASIO SDK at link time, which CI and most dev machines do not have.

crates/oak-codec/Cargo.toml

@@ -25,6 +25,6 @@ oak-core = { path = "../oak-core" }
 # release/<crate-version>, and every such pairing is broken upstream
 # (9.0.0 -> FFmpeg 9.0 removed AVCodec fields; 8.1.0 -> FFmpeg 8.1 added
 # enum variants; 8.0.0 -> FFmpeg 8.0 renamed FF_PROFILE_*).
-ffmpeg-next = { version = "9.0", features = ["static"] }
+ffmpeg-next = { version = "8", features = ["static"] }
 # `std::error::Error` impls for the crate-internal error enum.
 thiserror = "2"